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Repressable button in GUI

This class shows a GUI with a JLabel, a JButton and a JTextField. When klicking the button, an array of Strings in another class randomizes a String from the array and adds it to the textfield in this class. This works fine.

But I want the button to be repressable. I want the button to get a new randomized String from the array when I press it again, without restarting the program. How do I do?